I don't get it... According to Hanson's instructions on post #1, we should break in the engine on 32:1 during the first gallon of fuel.

And then you make it 30:1?
Even more oil AFTER the break in period???

Dimitrios

The point is that you can just continue with 32:1 after break in. Some will tell you 50:1 others 40:1, but most seem to agree that 25:1 to 32:1 is the "best" ratio to run.

I run 4% penzoil (25:1) in my Hanson, and did from day one. Tried 2% after running 10 L of fuel throught it, gave my motor the hickups. Would probably have ran fine if I had put some effort into it, but cba.. Went back to 4% and everything is great again

I can obtain these two Pennzoil fullsynthetic marine oils locally. The label and bottle shape looks different though... Which one should I get?

Dimitris

The picture in the first link appears to be of a different oil. The can clearly says "synthetic blend". Judging by the text, it is the right oil though - but I would call them and double check as you dont want synthetic blend.

I have to say that I really hate this creative wording by the way.
When they try to hide the real nature of a product and make it sound as something else, usually superior. Fullsynthetic, synthetic blend, fullsynthetic blend, etc...

I have to say that I really hate this marketing wording by the way.
When they try to to hide the real nature of a product and make it sound as something else, usually superior. Fullsynthetic, synthetic blend, fullsynthetic blend, etc...

Sure, prices are a little steep. But one can will make more than 90 L of fuel mixed at 4%.. That's alot of flying

The point is that you can just continue with 32:1 after break in. Some will tell you 50:1 others 40:1, but most seem to agree that 25:1 to 32:1 is the "best" ratio to run.

I run 4% penzoil (25:1) in my Hanson, and did from day one. Tried 2% after running 10 L of fuel throught it, gave my motor the hickups. Would probably have ran fine if I had put some effort into it, but cba.. Went back to 4% and everything is great again

Nobody seems to mention this here, so I will.
Coming from dirtbike tuning experience, this is what I have found.

If the oil mixture ratio is changed, the needles on the carb have to be adjusted as well. In this situation, changing from 25:1 to 50:1, there is now a 2% by volume increase in fuel being delivered to the engine through the needles. Remember that the carb is delivering both fuel and oil through these needles. Change the mixture and the needles have to change.

In the situation quoted, the engine would have went from running good to running rich. That's why the effort was needed.

The opposite is possible. If someone changes from 50:1 to 25:1 and notices that they have a lot of peak power, they may assume that the motor likes more oil. In actual fact, they are changing the effective jetting and running the motor leaner. The motor could actually be damaged in this situation. Sure it has tons of oil, but it is running hot because of the lean condition.

Just my 2 cents. Please keep this in mind when tuning two stroke engines.

I used the 100% synthetic marine from Penzoil at 32 to 1 for my 29cc PUH Hanson from the beginning as Hanson recommended . Piston is Clean and it runs beautifully . The power is great and she runs SMOOTH,, I have kept it at 32 to 1 and am very happy with the 29cc in my Spectra. What a great machine and motor., I think it is best to do what the builder recommends.no matter what you think. Give it a shot,,and you may be proved wrong.